13！/(2!2!2!2!）-412!/(2!2!2!）+611!/(2!2!)-4*10!/2!+9!

来源: AceOnRiver 于 2009-11-05 13:53:05 [旧帖] [给我悄悄话] 本文已被阅读：次

same reasoning as 恶狼, slightly different coefficients.

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13！/(2!2!2!2!）-4*12!/(2!2!2!）+6*11!/(2!2!)-4*10!/2!+9!